Regulation of dynamo-electric machines.



m. 895,965; PATENTED AUG, 11, 1908.

' 11.0. GLINKER.

REGULATIONOF DYNAMO ELECTRIC MACHINES, Y

APPLIGATIONI'I LEI) $EPT= 28, 1905.

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ATTYT UNITED STATES. PATENT onnron REGINALD C. CLINKER, OF RUGBY,ENGLAND, ASSIGNO'R TO GENERAL ELECTRIC COMPANY,

A CORPORATION OF NEW YORK.

RE GULATION OF DYNAMO-E LECTRIC MACHINES Specification of LettersPatent.

Patented Aug. 1 1, 1908.

Application filed September 28, 1905. Serial No. 280,499.

TOgZZZ whom it may concern: a

e it known that I, REGINALD C. CLINKER, subject of the King ofGreatBritain, resid ing at Rugby, county of Warwick, En land, 5haveinvented certain new and usefu Improvements in Regulation ofDynamo-Electric Machines, of which the following isa specification.

This invention relates todynamo electric machines having a winding onthe field magnet in series with the armature, and is articularlyapplicable to that class of machlnes known as series boosters orregulators, em-

1 5 istribution systems. As usually arranged,

resistance which is placed in series with the armature, the whole beinginserted intov the circuit the pressure of which is to be controlled, sot at whenan increase of the current flowing in the circuit takes placethe strength of .the magnetic field flux is increased, thereby'proportionally increasing the voltage added to the circuit by therevolving armature, and conversely when the current diminishes thevoltage supplied by.

the booster is correspondingly diminished.

Such machines, however, are sluggish in action, because a sudden changeof field current cannot produce an instantaneous change of flux owing tothe generation of o posing eddy currents in the mass of metal orming themagnetic circuit.

The object of this invention is to reduce .this sluggishness and tocause the flux of the machine to respond more uickly to a change ofcurrent. It is partic arly applicable tothe case where a shunt of lowresistance is required in parallel with the field winding] The featuresof novelty which characterize the invention are set forth withparticularity in the appended claims. itself, however, will be betterunderstood by reference to the following description taken in connectionwith the accompanying drawings which represent diagrammatically one ofthe various forms which the invention may assume-in practice.

In the drawing the invention is'represented 60 as applied to a boosterhaving an armature 1 connected in series with a feeder 2 or otherconductor of a system in which it is desired to insert the: booster'voltage. The field winding is indicated at 3 and is connected in serieswith the armature as indicated. In

gloyed for regulating the potential on electric such machines have afield winding of low The invention 7 order to make the magnetic flux dueto current in the winding'3 more quickly responsive to-variations ofcurrent in the main circuit, I provide a transformer 4 having twowindings thereon 5 and 6, the first of which is connected in series withthe booster cir cuit arid the second, namely the finding 6, 1n shunt tothe booster field winding 3. A

bridge piece 7 completes the magnetic 'circuit of the transformer exceptfor the small air gaps 8 and 9 which cause the core readily to lose itsmagnetism when the magnetizing, force is removed.

The core of the transformer is so constructed that the magnetic fluxtherein varies instantly with the variations of currentin the Winding 5,while the field-magnet 3 of the booster is necessarily so constructedthat 'when the cu'rrent'in the winding 3 varies, the

corresponding variation in magnetic flux lags behind the variation incurrent. If the current flowing through the circuit should suddenlyincrease, the increased current would divide between the field winding 3and the transformer .winding 6, which are connected in parallel; but allthe increase of current would necessarily flow through ,the Winding 5 ofthe transformer. An electromotive force would be instantly induced inthewinding 6, which would be proportional in amount to the rate of increaseof the current in the circuit, and would be in such a direction as toaugment the effect of the current flowing through the winding 3. Theresult would be a sudden and great increase of current flowing throughthe winding 3, and a corresponding quickening and strengthening of thefield of the booster. As soon as the current becomes steady, the inducedelectromotive force in the winding-.6 dies away, and the strength of thefield of the booster is then due only to the steady flow of currentthrough the winding 3. Similarly a decrease of current in the maincircuit causes a transient opposing current to flow from the secondary 6to the field winding which opposing current assists in reducing themagnetic flux of the machine When the main current is steady thesecondary circuit 6 actsas a simple shunt about the field winding 3, andthe com ounding of the machine may be varied if desired by varying theresistanceof this circuit.

' While I have shown my invention applied to a series booster, it willbe understood that it is equally applicable to any direct-currentdynamo-electric machine havin a windingon the field magnet in series witthe armature.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is:

1. The combination witha winding connected in series with an electricalcircuit, of a shunt for said winding, and means for varying the effectof said shunt in proportion to the rate ofi change of the load upon saidcircuit. 2. In an electrical device, the combination with a source ofcurrent, of a winding connected in series therewith, and means connectedin shunt to said winding for varying the voltage at the terminals of theWinding in proportion to the rate of change of the current.

3. The combination of a winding connected infseries with acircuit,of aconnection in shunt to, said winding, andmeans for generating insaidconnection an electromotive force proportional to the rate of changein load on said circuit.

4. The combination with adynamo-electric machine having a winding on itsfield magnetconnected in series with its armature,

of means for 'momentarily augmenting changes of voltage at the terminalsof said winding .due to changes in the load on the armature circuit proortionately'to the rate of change of the loa v5. The combination with adynamo-electrio machine having a winding on its field magnet connectedinseries with its armature, of a magnetic core having two windings'thereon, one in shunt to said field winding and the other inseries'with the armature circuit.

6. The combination with'a dynamo-electr1c machinehaving a field winding1n series 'with the external" circuit, of a transformer having onewlnding responsive to variations netic circuit and two.- windingsthereon, one

in shunt to said field winding and the other in series with the armaturecircuit 8. The combination of a dynamoelecti'ic machine havinga seriesfield winding, and a transformer having two windings, one connected inseries with the machine, and the other in shunt to said field winding Inwitness whereof, I have hereunto set my hand this ei hth day ofSeptember, 1905.

' R GINALD (l CLINKER. Witnesses:

E, M. WEBB, MARSHA HaLsrnAn.

